Why am I getting Yellow rusty leaves??

A few of my plants leaves are turning yellow with rusty spots and drying up on the ends. I noticed it just under two weeks ago, I done some research and thought it could be a calcium or magnesium deficiency.

I flushed the plants with plain phd water, on the next watering I used cal mag and biobizz alga mic and have been using this since then with biobizz bloom at a low strength in case it could be nute burn.

I also raised the lights a bit in case they were being burnt by the lights. But the plants still don’t seem to be recovering and I’m not sure how to fix them?? Could it be pests? I have also noticed a few more getting the same type of symptoms, so any help and advice how to stop this would be much appreciated.

The growing medium is plant magic supreme soil, I’m using biobizz bloom, alga mic and cal mag nutes, marshydro 2000w led lights and the water is always phd in between 6.4-6.7.

Flushing with plain water just washed out any food you had,always feed to some runoff so it removes any build up.
Looks starved but depends what you were feeding a month ago.

myke said:

Flushing with plain water just washed out any food you had,always feed to some runoff so it removes any build up.
Looks starved but depends what you were feeding a month ago.

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thanks for the reply, so you think I should up the nutes? I’ve been using them at about a quarter Recommended strength past week and a half in case it was nute burn causing this. A month ago I was feeding the biobizz fish mix and bloom but dropped the fish mix second week into flower, they are on 5th week of flower now.

Id say it looks like low ph, could be caused by anaerobic environment. The yellowing and necro spots are exactly what my plants looked like. Didnt take proper care of meter. But weed was dank at very low ph. I went back to litmus liquid, always reads accurate.

Potassium deficiency. As to why maybe you can figure it out.

Southernontariogrower said:

Id say it looks like low ph, could be caused by anaerobic environment. The yellowing and necro spots are exactly what my plants looked like. Didnt take proper care of meter. But weed was dank at very low ph. I went back to litmus liquid, always reads accurate.

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I calibrated my meter on my last grow so it should be alright, I’ll do it again tonight I always ph the water to the correct strength. I’ve read that when using biobizz products and using organic soil you don’t need to ph the water because the soil buffers it or something but I do anyways to be on the safe side.

hotrodharley said:

Potassium deficiency. As to why maybe you can figure it out.

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So up the nutes?

CARmick93 said:

So up the nutes?

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I’d give at least half strength

hotrodharley said:

I’d give at least half strength

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Ok thanks I’ll try that, I actually dropped the nutes and haven’t put them up for a week and a half as I thought it could be nute burn instead of a deficiency, so hopefully adding a bit more will sort them out.

It looks like light stress to me, how long since you have raised it, where was it (distance) and where is it now? With pottasium def you would notice that on lower leaves first than climbing up the plant. What does your supreme soil contains?

Looks like calcium def amongst summit else

Could it be thrips damaging the roots causing the leaves to die? Just found these marks on the leaves and done a quick google said it could be thrips??

I’ve had thrips for over 2 years. They live on the leaves as far as I know. Never had plants look like yours.